CN103412190B - Switch-class device state evaluation method based on parameter on-line identification - Google Patents
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Abstract
The invention discloses a switch-class device state evaluation method based on impedance parameter on-line identification. The switch-class device state evaluation method is suitable for switch-class devices in the 3/2 connection mode of a transformer substation. Real-time current data of the switch-class devices are used, actual operational data such as line currents and transformer currents inside the transformer substation are combined, resistance distribution conditions of the switch-class devices are identified, therefore, the resistance change conditions of the switch-class devices can be obtained, the abnormal resistance value condition caused by defects of the switch-class devices can be timely discovered, and the important reference basis is provided for device timely defect elimination. According to the switch-class device state evaluation method based on impedance parameter on-line identification, state evaluation on the switch-class devices can be dynamically carried out in an assisting mode, the operation is simple, computing is reliable, the operational cost is much lower than that of site detection testing, and the good adaptability and the good real-time performance are achieved. The switch-class device state evaluation method fills the blank in the field in China and provides a research thought for state maintenance of other high-voltage devices.
Description
Technical field
The present invention relates to Switch equipment on-line parameter identification method, in order to online auxiliary diagnosis Switch equipment whether existing defects.Belong to parameters of electric power system identification field.
Background technology
In recent years, the accident of electrical network 500kV isolating switch, disconnector generation catastrophic failure happens occasionally, to equipment, electrical network even personal safety bring larger threat.The contact resistance value of Switch equipment is the important evidence characterizing its state quality, contact resistance value exceeds normal value and shows that equipment may existing defects, as dynamic/static contact problems such as not in place, surface of contact scorification, kinematic link wander off of closing a floodgate all may cause contact resistance to increase.But affect a lot of because have of switch resistance, because switch resistance is μ Ω level, so the resistance of drainage thread, wire clamp also affects its relative deviation; In addition, due to thermal stability difference, the inconsistent meeting of the size of current flow through makes surface oxidation, and degree of aging is inconsistent, and oxidation and the aging resistance that all can make increase; Electrodynamic effect then can affect the tightness of the pressure of contact and wire clamp, bolt, thus affects contact resistance; The pollution level of each phase is inconsistent in addition also can affect resistance sizes.Above factor, when affecting the relative deviation of impedance generation between phase and phase, will cause current imbalance between three-phase.
Because contact resistance in-site measurement is relatively complicated, in the detection of Switch equipment, based on the principle that contact resistance increase can cause heating many, judge defect often through means such as Infrared survey, but there is following limitation in these class methods:
1, existence is measured periodically, cannot real time dynamic tracing equipment state situation.
When 2, carrying out Infrared survey, if the electric current flowing through equipment at that time under the method for operation is less, equipment heating is not obvious, then may be difficult to discovering device defect.
3,500kV transformer station adopts 3/2 wiring, owing to going here and there the shunting action of the equipment such as interior switch, when contact resistance value increases, the shunting flowing through this switchgear reduces, because heating is directly proportional with current squaring, fault location may be caused to generate heat not obvious, thus be difficult to find defect.
Utilize the method for operation of power networks data assistant analysis 500kV Switch equipment contact resistance variation situation.Cardinal principle is as follows:
500kV transformer station generally adopts 3/2 wiring, and the double bus scheme mode conventional with 220kV transformer station is different, and 3/2 mode of connection exists looped network shunting, and when branch resistance value each in going here and there changes, the interior trend that will cause going here and there changes, and now may produce following situation:
1, certain resistance that contacts increases, and causes this phase current to produce uneven situation with between other two-phase, and in the string of this phase simultaneously, trend distribution changes.
2, the switchgear resistance that respectively contacts all increases, and between each phase current, uneven situation all occurs, and in the string of every phase, trend distribution all changes.
The resistance value of the equipment such as interior switch, disconnecting link, guide wire, joint is respectively gone here and there under normal circumstances for tens of micro-ohm rank by 500kV transformer station, numerical value is small, unavoidably there is a small amount of deviation in each phase resistance value, observe according to actual operating data, more or less there is uneven situation in each three-phase current, is only difficult to locate which platform switchgear contact resistance with current imbalance situation in string and increases.But by existing substation operation data (comprise each Switching Shunt, each bar go out line current, transformer current), adopt the mode of parameter identification, judge whether the resistance value of each string changes.
Summary of the invention
For overcoming the defect existed in prior art, the invention provides a kind of Switch equipment method for evaluating state based on on-line parameter identification, Switch equipment contact resistance index can be followed the tracks of in real time dynamically, there is provided important reference for whether evaluation Switch equipment defect occurs, contribute to Timeliness coverage fault, eliminate defect.
Switch equipment method for evaluating state based on on-line parameter identification takes following technical scheme to realize, and carries out on-line identification based on current error minimum principle to Switch equipment state, and its step of concrete identification process is as follows:
(1) with transformer station respectively go here and there putting into operation of interior Switch equipment time measured resistance value for initial value, build the detailed computation model of transformer station;
(2) go out the actual operating data such as line current, transformer current according to transformer station, according to transformer station's computation model, calculate the current value flowing through each string switch;
(3) the Current calculation value of each string switch is compared with actual measured value, obtain current error;
(4) based on the principle that current error is minimum, utilize optimized algorithm to change contact resistance value, re-start Switching Shunt and calculate, proceed the error ratio pair between same actual measured value, continue to optimize until error mean square root is lower than 4%, Switch equipment contact resistance value is now considered as actual value;
(5) according to the concrete Switch equipment object optimizing the Switch equipment diagnosis existing defects that front and back resistance value changes.
The aforesaid Switch equipment method for evaluating state based on on-line parameter identification, it is characterized in that error minimum principle is in Switch equipment state evaluation, have and can carry out the advantage of parameter identification under any method of operation of system to switchgear in any transformer station, there is good adaptability and real-time, simultaneously simple to operate, be easy to realize.
Principle of the present invention is specifically described as follows:
(1) Part I of technical scheme: the contact-ratio model parameter of the interior switch that can arrive at a station according to parameters such as the resistance that the equipment such as switch, plug-in strip, stream change in station are surveyed, can build the detailed model of transformer station in conjunction with primary connection figure in electricity grid substation.
(2) Part II of technical scheme: after determining transformer station model and parameter, select the outlet trend of section sometime and transformer trend and busbar voltage as boundary condition, utilize electric system synthesizer PSASP to carry out the simulation calculation of switching current.
(3) Part III of technical scheme: when not carrying out any check to actual measurement parameter, compares the Current calculation value of each string switch with actual measured value, obtains current error.
(4) Part IV of technical scheme: based on the principle that error is minimum, optimized algorithm is utilized to change contact resistance value, re-start Switching Shunt to calculate, proceed the error ratio pair between same actual measured value, continue to optimize until error is minimum, switch now etc. that equipment contact resistance value can be considered actual value.
Diagnosis object is the interior each Switch equipment of 500kV transformer station string of employing 3/2 mode of connection.
The modeling of Switch equipment in transformer station is carried out according to the actual measurement parameter of the resistance of switch, plug-in strip and stream change, boundary condition comprises each string outlet is sent meritorious and idle, that send under each string main transformer self is meritorious and idle, the voltage of bus and the capacity of filter apparatus in string in standing.
PSASP software is adopted diagnosis object to be carried out to the calculating of modeling and switching current.
The described step utilizing optimized algorithm to change contact resistance value is: by continuous iterative modifications switch resistance value parameter, every iteration once all calculates once the electric current of each switch, and carry out error ratio pair with actual measurement electric current, calculating current error, and calculate each switching current mean square of error root, the criterion that iteration terminates is when switching current error is lower than 5%, and in Optimized Iterative process, switching current error mean square root with last round of root mean square compare reduction lower than 10% time, iterative process terminates.
When building transformer station's computation model, the disconnector of isolating switch and both sides is equivalent to a switchgear.
The resistance order of magnitude of described Switch equipment is all in micro-ohm level.
The beneficial effect that the present invention reaches:
The present invention is a kind of Switch equipment state auxiliary evaluation method based on impedance parameter on-line identification.Remote equipment condition diagnosing technology provides technical basis not only to the supervision of status of electric power, and can also provide increasing support to maintenance decision, be a kind of aid decision-making method of advanced IT application.Switch equipment state evaluation based on on-line parameter identification can follow the tracks of Switch equipment contact resistance index in real time dynamically, important reference is provided for whether evaluation Switch equipment defect occurs, Switch equipment catastrophic failure is there is for taking precautions against in advance, personal safety, the power grid security accident caused is avoided to provide important technology to support, raising electrical network economy and social benefit.Traditional periodic plan maintenance is generalized to repair based on condition of component by this method, meets the inexorable law of scientific development, contributes to Timeliness coverage Failure elimination defect, have important practical significance to the safe and stable operation of whole electric system.Method proposes the Switch equipment method for evaluating state based on on-line parameter identification, be applicable to the Switch equipment under transformer station 3/2 mode of connection, according to current distributing situation in string under 3/2 mode of connection with the closely-related principle of Switch equipment resistance value, utilize the real-time current data of Switch equipment, in conjunction with power transformation Divergent line electric current, the actual operating data such as transformer current, identification is carried out to the distribution of resistance situation of Switch equipment, thus obtain the resistance variations situation of Switch equipment, for the situation causing resistance value exception after Switch equipment generation defect, can find timely, thus provide important reference for the timely defect elimination of equipment.The auxiliary state evaluation carrying out switchgear of the method dynamic, calculating simple to operate is reliable, and operating cost is tested far below Site Detection, has good adaptability and real-time.This achievement compensate for the domestic blank in this field, also for the repair based on condition of component of other high-tension apparatuses provides Research Thinking.
Accompanying drawing explanation
Fig. 1 is station, Wujiang computation model figure;
Station, Fig. 2 Wujiang switching current result of calculation.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
For station, Wujiang, station, Wujiang adopts 3/2 mode of connection, and the equipment contact resistance value such as interior switch of standing are as shown in table 1, and station, the Wujiang inner model built as shown in Figure 1.
Equipment contact resistance value (the unit: 10 such as switch in station, table 1 Wujiang
-6ohm)
| Device name in string | Contact resistance (μ Ω) | Device name in string | Contact resistance (μ Ω) |
| 5003 streams become | 15 | 5032 plug-in strips | 75 |
| 5011 switches | 78 | 5032 plug-in strips | 87 |
| 5011 streams become | 8 | 5033 switches | 67 |
| 50111 plug-in strips | 73 | 5033 plug-in strips | 94 |
| 50112 plug-in strips | 75 | 5041 switches | 76 |
| 5012 switches | 78 | 5042 switches | 72 |
| 5012 streams become | 7 | 5043 switches | 75 |
| 50121 plug-in strips | 77 | 5051 switches | 76 |
| 50132 plug-in strips | 81 | 5052 switches | 75 |
| 5031 switches | 74 | 5052 plug-in strips | 95 |
| 50312 plug-in strips | 78 | 5053 switches | 73 |
| 5032 switches | 66 | 5053 plug-in strips | 92 |
In calculating station, gained Wujiang, each switching current as shown in Figure 2.
Station, Wujiang switching current contrast situation is as shown in table 2.
The switching current contrast of station, front Wujiang checked by table 2
| Switch names | Actual current (A) | Calculating current (A) | Absolute deviation (A) | Relative deviation |
| 5003 | 192.36 | 193.8 | 1.44 | 0.75% |
| 5011 | 194.34 | 248.3 | 53.96 | 27.77% |
| 5012 | 7.81 | 52.5 | 44.69 | 572.22% |
| 5021 | 291.02 | 337.3 | 46.28 | 15.90% |
| 5022 | 123.05 | 148.2 | 25.15 | 20.44% |
| 5023 | 214.84 | 176 | -38.84 | -18.08% |
| 5031 | 113.28 | 139.4 | 26.12 | 23.06% |
| 5032 | 396.48 | 384.8 | -11.68 | -2.95% |
| 5033 | 78.12 | 60.8 | -17.32 | -22.17% |
| 5041 | 210.94 | 237.9 | 26.96 | 12.78% |
| 5042 | 412.11 | 365.5 | -46.61 | -11.31% |
| 5043 | 220.7 | 171.4 | -49.3 | -22.34% |
| 5051 | 185.55 | 205.7 | 20.15 | 10.86% |
| 5052 | 443.36 | 414.5 | -28.86 | -6.51% |
| 5053 | 121.09 | 92.6 | -28.49 | -23.53% |
Error analysis is carried out to station, Wujiang switching current now, square error is 148.71%, relative error is very large, paying particular attention to 5012 switching current errors obviously exists unreasonable, to have reason in suspection 5012 station switchgear existing defects or field measurement parameter inaccurate, and the upper current imbalance of each string is also more obvious, parameter obviously exists unreasonable, need the iteration of being carried out switch resistance by optimized algorithm, the switching current after continuous compute switch resistance iteration also carries out error ratio pair with real current error.
After being checked by optimized algorithm, each switch parameter of station, Wujiang, the parameter before and after optimizing is as shown in table 3, and final calculating current and actual current contrast as shown in table 4.
Station, table 3 Wujiang switch resistance contrasts before and after checking
| Switch names | Before check | After check |
| 5003 | 0.000165 | 0.000165 |
| 5011 | 0.000234 | 0.000234 |
| 5012 | 0.000245 | 0.004860 |
| 5021 | 0.000245 | 0.000249 |
| 5022 | 0.000245 | 0.000492 |
| 5023 | 0.000245 | 0.000213 |
| 5031 | 0.000247 | 0.000289 |
| 5032 | 0.000238 | 0.000242 |
| 5033 | 0.000251 | 0.000254 |
| 5041 | 0.000236 | 0.000270 |
| 5042 | 0.000232 | 0.000238 |
| 5043 | 0.000235 | 0.000206 |
| 5051 | 0.000246 | 0.000246 |
| 5052 | 0.000260 | 0.000260 |
| 5053 | 0.000255 | 0.000127 |
From optimum results, after being checked by optimized algorithm, station, Wujiang switch parameter change mainly 5012 switch resistances has changed general 20 times.
The switching current contrast of station, rear Wujiang checked by table 4
| Switch names | Actual current (A) | Calculating current (A) | Absolute deviation (A) | Relative deviation |
| 5003 | 192.36 | 195.8 | 3.44 | 1.79% |
| 5011 | 194.34 | 203.9 | 9.56 | 4.92% |
| 5012 | 7.81 | 7.7 | -0.11 | -1.41% |
| 5021 | 291.02 | 304.1 | 13.08 | 4.49% |
| 5022 | 123.05 | 117.2 | -5.85 | -4.75% |
| 5023 | 214.84 | 209.9 | -4.94 | -2.30% |
| 5031 | 113.28 | 120.1 | 6.82 | 6.02% |
| 5032 | 396.48 | 408.1 | 11.62 | 2.93% |
| 5033 | 78.12 | 79 | 0.88 | 1.13% |
| 5041 | 210.94 | 204 | -6.94 | -3.29% |
| 5042 | 412.11 | 402.3 | -9.81 | -2.38% |
| 5043 | 220.7 | 207.8 | -12.9 | -5.85% |
| 5051 | 185.55 | 182.5 | -3.05 | -1.64% |
| 5052 | 443.36 | 439.5 | -3.86 | -0.87% |
| 5053 | 121.09 | 114.9 | -6.19 | -5.11% |
After checking optimization, station, Wujiang switching current carries out error analysis, square error is 3.69%, square error now has clear improvement before comparing check, and the upper distribution of current of part string also comparatively balances, can think that parameter is now very close to actual parameter, due to Main change before and after optimization is that 5012 switch resistances expand 20 times, therefore judges that 5012 switches may existing defects.
In addition, the modeling of this method is that the disconnector of isolating switch and both sides thereof is equivalent to a switchgear, therefore, for may be that one or several in 5012 switches and both sides disconnector go wrong in the 5012 switch defect reality that this method is determined, but this method is for finding that defect provides important evidence, significantly reducing scope for searching defect, having important directive function for in-site measurement.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (7)
1. based on a Switch equipment method for evaluating state for on-line parameter identification, it is characterized in that: carry out on-line identification based on current error minimum principle to Switch equipment state, concrete identification process comprises the following steps:
(1) with transformer station respectively go here and there putting into operation of interior Switch equipment time measured resistance value for initial value, build transformer station's computation model;
(2) go out line current, transformer current actual operating data according to transformer station, according to transformer station's computation model, calculate the current value flowing through each string switch;
(3) the Current calculation value of each string switch is compared with actual measured value, obtain current error;
(4) based on the principle that current error is minimum, utilize optimized algorithm to change contact resistance value, re-start Switching Shunt and calculate, proceed the error ratio pair between same actual measured value, continue to optimize until error mean square root is lower than 4%, Switch equipment contact resistance value is now considered as actual value;
(5) according to the concrete Switch equipment object optimizing the Switch equipment diagnosis existing defects that front and back resistance value changes.
2. the Switch equipment method for evaluating state based on on-line parameter identification according to claim 1, is characterized in that: diagnosis object is the interior each Switch equipment of 500kV transformer station string of employing 3/2 mode of connection.
3. the Switch equipment method for evaluating state based on on-line parameter identification according to claim 1, it is characterized in that: the modeling carrying out Switch equipment in transformer station according to the actual measurement parameter of the resistance of switch, plug-in strip and stream change, boundary condition comprises each string outlet is sent meritorious and idle, that send under each string main transformer self is meritorious and idle, the voltage of bus and the capacity of filter apparatus in string in standing.
4. the Switch equipment method for evaluating state based on on-line parameter identification according to claim 1, is characterized in that: adopt PSASP software diagnosis object to be carried out to the calculating of modeling and switching current.
5. the Switch equipment method for evaluating state based on on-line parameter identification according to claim 1, it is characterized in that: the described step utilizing optimized algorithm to change contact resistance value is: by continuous iterative modifications switch resistance value parameter, every iteration once all calculates once the electric current of each switch, and carry out error ratio pair with actual measurement electric current, calculating current error, and calculate each switching current mean square of error root, the criterion that iteration terminates is when switching current error is lower than 5%, and in Optimized Iterative process, switching current error mean square root with last round of root mean square compare reduction lower than 10% time, iterative process terminates.
6. the Switch equipment method for evaluating state based on on-line parameter identification according to claim 1 and 2, is characterized in that: when building transformer station's computation model, and the disconnector of isolating switch and both sides is equivalent to a switchgear.
7. the Switch equipment method for evaluating state based on on-line parameter identification according to claim 1 or 3, is characterized in that: the resistance order of magnitude of described Switch equipment is all in micro-ohm level.
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| CN104268376B (en) * | 2014-09-11 | 2017-03-15 | 国家电网公司 | A kind of 3/2 mode of connection switchyard switch resistance online evaluation method |
| CN104793132B (en) * | 2015-04-21 | 2018-07-06 | 西安工程大学 | Disconnecting switch contact condition detection device and detection method based on electric-field sensor |
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| CN113203917B (en) * | 2021-04-25 | 2022-11-18 | 国网河南省电力公司平顶山供电公司 | Method for pre-judging heating defect of diversion loop of reactive power compensation device |
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